| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery having electrodes which can be prevented from being curved by rolling.SOLUTION: A nonaqueous electrolyte secondary battery 100 of the present invention comprises an electrode group 3 formed by winding belt-shaped electrodes 34. The electrodes 34 each have: a base foil 34d; and a mixture layer 34a formed by applying an active material mixture to each face of the base foil 34d. The base foil 34d has: a coated region P1 with the active material mixture applied thereto; and an uncoated region P2 made by a part of the base foil 34d, to which the active material mixture is not applied, and extending along one end in a widthwise direction of the base foil. The uncoated region P2 is formed to gradually increase in its thickness from one end toward the other end in the widthwise direction of the base foil 34d, and to have a difference in height at a boundary position P3 with the coated region P1.SELECTED DRAWING: Figure 4 |
